US3684711A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antioxidant for ester base functional fluids
Assignee: Monsanto Co
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Filing: 1970-04-13
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Granted: 1972-08-15
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Expires: 1990-04-13
Abstract
Abstract THE OXIDATION RESISTANCE OF SYNTHETIC ESTER BASED LUBRICANTS IS ENHANCED BY INCORPORATING IN THE LUBRICANT SMALL AMOUNTS OF A COMPLEX ALKALI METAL ORGANOPHOSPHORUS COMPOUND PREPARED BY ESTERIFYING A POLYHYDRIC ALCOHOL FREE OF BETA HYDROGEN WITH A CARBOXYLIC ACID OR ACID DERIVATIVE AND A PHOSPHORUS ACID OR ACID DERIVATIVE TO FORM A COMPLEX ORGANOPHOSPHORUS ESTER, AND THEREAFTER CONTACTING THE ESTER WITH AN ALKALI METAL BASE.
Inventors
- 👤 Quentin E Thompson
- 👤 Stanley L Reid
- 👤 Richard W Weiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:08
CPC Classifications
C; C10; C10M; C10M3/00; C10M2207/00; C10M2207/02; C10M2207/023; C10M2207/025; C10M2207/28; C10M2207/281; C10M2207/282; C10M2207/283; C10M2207/286; C10M2207/287; C10M2207/289; C10M2207/30; C10M2207/34; C10M2209/00; C10M2209/02; C10M2209/08; C10M2209/084; C10M2209/10; C10M2209/103; C10M2209/109; C10M2215/00; C10M2215/02; C10M2215/06; C10M2215/064; C10M2215/065; C10M2215/066; C10M2215/14; C10M2215/22; C10M2215/221; C10M2215/225; C10M2215/226; C10M2215/24; C10M2215/30; C10M2219/00; C10M2219/10; C10M2219/104; C10M2219/108; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/042; C10M2223/045; C10M2223/049; C10M2223/06; C10M2223/065; C10M2229/00; C10M2229/02; C10M2229/04; C10M2229/05; C10N; C10N2040/00; C10N2040/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |